.nav{
    overflow: hidden;
}
.sk{
    position: absolute;
    left: 190px;
    top: 40px;
    padding: 3px 0 0  14px;
    border-left: 1px solid #c81523;
}


.sk_list {
    float: left;
}
.sk_list  ul li {
    float: left;
}
.sk_list  ul li a {
    display: block;
    line-height: 47px;
    padding: 0 30px;
    font-size: 16px;
    font-weight: 700;
    color: #000;
}
.sk_con{
    float: left;
}
.sk_con ul li{
    float: left;
}
.sk_con  ul li a {
    display: block;
    line-height: 49px;
    padding: 0 20px;
    font-size: 14px;
   
}
.sk_con  ul li:last-child a::after{
    content: '\e91e';
    font-family: 'icomoon';
}

.sk_bd ul li{
    float: left;
    margin-right: 13px;
    overflow: hidden;
    width: 290px;
    height: 460px;
    /* transparent透明色的 盒子本身就有border 若后边要更改。前边就必须设置transparent */
    border: 1px solid transparent;
}
.sk_bd ul li:nth-child(4n) {
    margin-right: 0;
}

.sk_bd ul li:hover{
    border: 1px solid #c81523;
}

/* 介绍界面制作 */
.tab_list ul li {
    list-style-type: none;
}

.tab {
    /* width: 978px; */
}

.tab_list {
    height: 39px;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}

.tab_list li {
    float: left;
    height: 39px;
    line-height: 39px;
    padding: 0 20px;
    text-align: center;
    cursor: pointer;
}

.tab_list .current {
    background-color: #c81623;
    color: #fff;
}

.item_info {
    padding: 20px 0 0 20px;
}

.item {
    display: none;
}
.tab_con .item {
    font-size: 25px;
}